RE: SAITO 220
I don't know much about the bore/stroke ritio's but I have a Saito 120 and it's the best engine i've ever owned. If the Saito 220 is anything like the 120 It will be a winner!! The 120 is on a 65" OMP yak profile and at 7 1/2 lbs. It's awsome! The 120 runs very smooth and bearly shakes this very light airframe. I think it has a lot to do with the idle mixture. I fly this plane with a 12 oz. tank and get 15 min. flights with fuel to spare. Fly around at 1/4 throttle, hover about 1/2 throttle, vertical pullout of hover at full throttle like a rocket!! Sips fuel. I think you get the idea. I think the 220 with it's original case design will be great.
Marc 540